Repo created

3party/agg/agg_span_allocator.h

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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_SPAN_ALLOCATOR_INCLUDED
+#define AGG_SPAN_ALLOCATOR_INCLUDED
+
+#include "agg_array.h"
+
+namespace agg
+{
+    //----------------------------------------------------------span_allocator
+    template<class ColorT> class span_allocator
+    {
+    public:
+        typedef ColorT color_type;
+
+        //--------------------------------------------------------------------
+        AGG_INLINE color_type* allocate(unsigned span_len)
+        {
+            if(span_len > m_span.size())
+            {
+                // To reduce the number of reallocs we align the 
+                // span_len to 256 color elements. 
+                // Well, I just like this number and it looks reasonable.
+                //-----------------------
+                m_span.resize(((span_len + 255) >> 8) << 8);
+            }
+            return &m_span[0];
+        }
+
+        AGG_INLINE color_type* span()               { return &m_span[0]; }
+        AGG_INLINE unsigned    max_span_len() const { return m_span.size(); }
+
+    private:
+        pod_array<color_type> m_span;
+    };
+}
+
+
+#endif
+
+